Solubilities of CeO2, HfO2 and Y2O3 in Fused Na2SO4-30 mol% NaVO3 and CeO2 in Pure Na2SO4 at 900 C
Abstract
The acidic and basic solubilities of the potential thermal barrier oxide components CeO2, HfO2, and Y2O3 were measured as a function of solvent basicity for fused Na2SO4-30 mol% NaVO3 at 900 C and 1 atm O2. Y2O3 solubility was higher than that of CeO2 or HfO2. For comparison, the solubility of CeO2 was measured in pure Na2SO4. In the mixed sulfate-metavanadate melts, the oxides formed orthovanadate acidic solutes with a solubility much higher than the corresponding acidic sulfates for the pure Na2SO4 melt. The results point to a revised mechanism for hot corrosion of alloys by acidic fluxing. Solutions of Na2SO4 with the salts of strong acids (e.g., V2O5, MoO3, and WO3) provide higher acidic solubilities for protective oxides by forming solutes involving the complex anions. These mixed solvent solutions are generally buffered to higher basic values.
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The solubilities and dissolution mechanisms of metal oxides in molten Na2SO4 depend on the value of -log(aNa2O).
“As discussed below, the solubilities and dissolution mechanisms of metal oxides in molten Na2SO4 are dependent on the value of -log(aNa2O).”
From A review on molten sulfate salts induced hot corrosion (2021) · cites this paper as [72]
Cites
Mechanisms for the hot corrosion of nickel-base alloys
Goebel, J. A., Pettit, F. S., & Goward, G. W. (1973) · Metallurgical Transactions · doi:10.1007/bf02649626 · Cited by 420 · see citing works
The Solubilities of NiO , Co3 O 4, and Ternary Oxides in Fused Na2 SO 4 at 1200°K
Gupta, D. K., & Rapp, R. A. (1980) · Journal of The Electrochemical Society · doi:10.1149/1.2129374 · Cited by 94 · see citing works
Self-citationSolubility of α ‐ Al2 O 3 in Fused Na2 SO 4 at 1200 K
Jose, P. D., Gupta, D. K., & Rapp, R. A. (1985) · Journal of The Electrochemical Society · doi:10.1149/1.2113944 · Cited by 58 · see citing works
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Hot Corrosion of Metals and Alloys
Pettit, F. (2011) · Oxidation of Metals · doi:10.1007/s11085-011-9254-6 · Cited by 241 · see citing works
A review on molten sulfate salts induced hot corrosion
Hu, S., Finklea, H., & Liu, X. (2021) · Journal of Materials Science & Technology · doi:10.1016/j.jmst.2021.03.013 · Cited by 183 · see citing works
- Authors
- Zhang, Y. S., & Rapp, R. A.
- Affiliations
- The Ohio State University (US)
- ORCID
- Zhang, Y. S.
- Venue
- Corrosion
- Published
- 1987-06-01
- Volume
- 43
- Issue
- 6
- Pages
- 348-352
- ISSN
- 0010-9312 (ISSN-L)
- 1938-159X
- OpenAlex
- W2221749797
- Cited by
- 48
- References
- 3
- Citations by year
- 2026: 1 · 2023: 1 · 2022: 3 · 2021: 2 · 2020: 2 · 2019: 3 · 2017: 3 · 2016: 3 · 2015: 1 · 2014: 1 · 2013: 2
- FWCI
- 9.33
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- CORROSION (publishedVersion)
- Funders
- Division of Materials Research
- Topics
- Physical Sciences › Engineering › Aerospace Engineering › High-Temperature Coating Behaviors
- Physical Sciences › Chemical Engineering › Fluid Flow and Transfer Processes › Molten salt chemistry and electrochemical processes
- Physical Sciences › Engineering › Mechanical Engineering › Metallurgical Processes and Thermodynamics
- Keywords
- cerium oxide, hafnium oxide, yttrium oxide, thermal barrier coatings, solubility, metavanadate, orthovanadate, hot corrosion, basicity, molten salts
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